RA2000 Series Thermostatic Radiator Valves 1hago.danfoss.com/PCMPDF/1-pipe steam...

Hydronic Heating Division – North America

MAKING MODERN LIVING POSSIBLE

RA2000 SeriesThermostatic Radiator Valves

1-pipe Low Pressure Steam Systems


VA.GW.E1.22©Danfoss 01/2012



1-pipe Steam System

• Concept– 3 things inside the piping

and radiation• Air• Steam• Condensate

• Advantages– Simple to pipe– Few components

• Disadvantages– Piping design critical– Venting balance important– Hard to control



Simple Control

• The Manual Valve– Steam and condensate in different

direction through valve– Properly sized supply valve– Fully open or fully closed… only

• The Air Vent– High capacity air vents on the main– Smallest capacity vents on the near

boiler radiators– Adjustable air vents



Key Evidence on a 1-pipe Steam System

• The removal of air from the system, allows steam to desired locations

• Proper venting is key in system operation

• Requires proper sized piping and pitch

Improper method Proper method



1-Pipe Counter Flow Steam System



Parallel Flow System

Heat Source

Vent Valve

Water Line

MainVent

Supply Valve

Wet Return

Hartford Loop



Up-Feed System



“Human race did not leave the stone age because we ran out of stones. We simply found a

better way to do things.”

What if you could control each radiator…automatically?



Take Control

Thermostatic Radiator Assembly (TRV)Provided Benefits

– Non-electric

– Self contained

– Self regulating

– Zoning capabilities

– Simple use of operation

– Potential fuel savings of more than 20%



How do we do it?

Air Vent Only• Steam enters the radiator and forces

the air out through the vent

• When the steam reaches the air vent, the vent closes

• The radiator is now filled with steam and radiates heat into the room

• Overheating can occur

Installed TRV Assembly• Steam enters the radiator and forces the

air through the air vent

• The TRV regulates the ability for the air to escape from the radiator based on room temperature and TRV set point

• The radiator is filled with an amount of steam meeting the set point, preventing overheating and saving fuel



Typical 1-Pipe Steam Thermostatic Radiator Valve Assembly

Air vent

1-Pipe Steam Valve Body(typically 1/8” male NPT)

Vacuum Breaker

Thermostatic Operator

1-pipe steam valve assembly



TRV’s Reaction

• The thermostatic operator reacts to the heat gains and heat losses within the room

• Free heat gains within a room can originate from:– Solar gain

– Appliances

– Occupants within the room

• Therefore …



Typical Installation ConfigurationsFree Standing Radiator

Built-in dial & sensor

Dial w/ remote sensor

Tamper proof dial w/ remote sensor

Tamper proof dial and sensor



Typical Installation ConfigurationsEnclosed Radiator

Remote wall mount dial and sensor

Cabinet mounted dial w/ remote operator & sensor



Typical Installation ConfigurationsConvector

Remote wall mount dial and sensor

Cabinet mounted dial w/ remote operator & sensorAvailable brass

street elbows



Typical Valve Pattern

Straight shank air vent

1-pipe steam valve



1) With steam system down, carefully remove existing air vent.

3) Tighten the straight shank air vent to the valve body

(Do not use angle air vent)

Method of Installation

2) Carefully tighten the valve body into the air vent tapping

4) Attach the thermostatic operator to the valve body



Dial up comfort. Dial down heating costs.Achieve energy savings by installing the Danfoss thermostatic radiator valve.

RA2000 Series Thermostatic Radiator Valves 1hago.danfoss.com/PCMPDF/1-pipe steam...

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